A sample of 81 account balances of a credit company showed an average balance of $1,200 with a standard deviation of $126.  You want to determine if the mean of all account balances is significantly different from last years average balance of $1,150.  Use a .05 level of significance. State the null and alternative hypothesis. What is the rejection rule? Compute the value of the test statistic z. What is the conclusion?

Q: Manager claims average sales for her shop is $1800 a day during winter months. 10 winter days…

A:

Q: Are you smarter than a second-grader? A random sample of 62 second-graders in a certain school…

A: GivenMean(x)=57sample size(n)=62standard deviation(σ)=14α=0.10

Q: A store manager claims that the mean amount of time customers spend waiting in line is less than the…

A: Given: Population meanμ=3.7Sample meanx¯=3.3Sample size(n)=85Sample standard deviations=0.8

Q: According to the National Association of Home Builders, the average cost of building a home in the…

A: The population average is given to be $117.91 per sq foot The sample mean and standard deviation are…

Q: Consider a value to be significantly low if its z score less than or equal to -2 or consider a value…

A: Given: Mean μ=19.8 Standard deviation σ=5.2 If  z≤-2, lowz≥2, high

Q: Select appropriate variables of your choice (not an example from lab handout or PP slides) to…

A: The descriptive information has given in table (1). In which the mean of variables 'English only',…

Q: sports analytics firm would like to test whether Kyrie Irving’s points per game is different from…

A: Sample size=19

Q: Use the normal distribution of SAT critical reading scores for which the mean is 501 and the…

A: Given that  SAT critical scores are normally distributed. Mean (μ) = 501 Standard deviation (σ) =…

Q: Conduct a t-test at the .01 level. You are interested in the income of American adults. In your…

A: Please see ExplanationExplanation:Given:a = 0.01n = 361x = 19500s = 3800 We need to test if the mean…

Q: You are employed to check quality control at a company that bottles drinks.  Cans of drink should…

A: # Given: Hypothesized mean mu=8 oz  sample size n is small ,sample mean xbar=7.91 oz  & sample…

Q: The monthly expenditures on food by single adults living in one neighborhood of Los Angeles are…

A:

Q: Miller's department store issues its own credit card. The credit manager claims that the average,…

A: The provided information are: Population meanμ=400Population standard deviationσ=38Sample size (n) =…

Q: Is there a doctor in the house? A market research firm reported the mean annual earnings of all…

A: GivenMean(x)=192890sample size(n)=47standard deviation(s)=43117α=0.01

Q: An article in a local town newspaper discusses the results of state test scores in their town. The…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: Given Information: Population mean (u) = 4.5 years Sample size (n) = 47 Sample mean (x) = 5.1 years…

Q: You are interested in the income of American adults. In your sample, there are 361 adults with a…

A: The sample mean = $19500.Sample standard deviation = $3800sample size = 361population mean =…

Q: (c) Calculate a 95% confidence interval (in hours) for the mean number. hours spent in volunteer…

A: From given data we have the sample mean , sample standard deviation and sample size as :…

Q: Do shoppers at the mall spend the same amount of money on average the day after Thanksgiving…

A:

Q: Cost of Building a Home According to the National Association of Home Builders, the average cost of…

A: State the given values,

Q: pach Baker will give an A to any of his High School runners whose times are in ti stest 20% in the…

A:

Q: Consider a value to be significantly low if its z score less than or equal to -2 or consider a value…

A:

Q: A pharmaceutical company claims that the employees' salary average = 1047 dollars. We want to test…

A: The claim is that Employees average salary . µ = 1047 Number of samples collected, n = 49 Sample…

Q: If you have a population standard deviation of 10 and a sample size of 4, what is your standard…

A: Given,population standard deviation(σ)=10sample size(n)=4

Q: Do men take a different amount of time than women to get out of bed in the morning? The 54 men…

A: Given Information: Men: Sample size n1=54 Sample mean x¯1=4.3 Standard deviation s1=1.4 Women:…

Q: Suppose your favorite coffee machine offers 6 ounce cups of coffee. The actual amount of coffee put…

A:

Q: Identify the factors that affect whether or not the results of a t-test will be significant. [mark…

A: Test statistic t = (X‾ - μ) / (s / √n)

Q: In a recent survey, it was stated that Filipino teens watch television on average 3.5 hours per day.…

A: Given : sample size = n = 20 Sample mean = x = 3.1 Standard deviation = s = 3.1

Q: Part (1) What is the p-value? (Round your answer to four decimal places.) Enter a number. Part (g)…

A:

Q: A coach believes that her volleyball team is more athlêtič than thể average Volleyball ted…

A: The standard error can be calculated as: SE=sn

Q: 10. What is the computed test statistic?

A: It is given that Sample size n = 100 Sample mean M = 144 Population SD = 20 Population mean = 150

Q: In order to determine the average price of hotel rooms in Atlanta, a sample of 64 hotels was…

A: given data  n = 64x¯= 112.5s = 15α = 0.1claim: μ≠108

Q: According to the National Association of Home Builders, the average cost of building a home in the…

A: Let μ denotes the population mean cost. The test is that the mean cost differs from $117.91 or not.…

Q: A pharmaceutical company claims that the employees' salary average = 1047 dollars. We want to test…

A:

Q: 1. In the packaging of M&Ms, inspectors collected a representative sample of 64 bags of M&Ms and…

A: It is given that the sample of 64 bags of M&Ms are collected by inspectors. The sample mean is…

Q: The average cup of coffee is supposed to contain 7.0 ounces. A random sample of ten cups of coffee…

A:

Q: 2. The average gasoline price of one of the major oil companies has been $1.00 per gallon. Because…

A: That is, there is no evidence to conclude that the average gasoline price of one of the major oil…

Q: Grace Floral Shop claims that their average daily earnings is $497. An auditor wants to determine…

A: Solution: Let X be the daily earnings. From the given information, x-bar = $495, S=$9.75 and n=100.

Q: How often do people who live near the beach actually visit the beach? A random sample of 25…

A:

Q: Consider a value to be significantly low if its z score less than or equal to -2 or consider a value…

A:

Q: ??

A: Step 1:Given:n = 47x = 98.21 °Fs = 1.16 °F μ = 98.6 Goal: Test the claim that the mean body…

Q: The Florida Tribune published an article that claimed that nurses in Tampa earn more than nurses in…

A: